The Collaborative International Dictionary of English v.0.48:

Leptoptilus \Leptoptilus\ n.
   A genus of birds including the adjutant bird (Leptoptilus
   dubius, also called adjutant stork) and marabous.

   Syn: genus Leptoptilus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Leptoptilus
    n 1: adjutant birds and marabous [syn: Leptoptilus, genus
         Leptoptilus]